Turret-lathe.



Patented Mar. 26, I901. D. B. BULLARD.

TURRET LATHE.

(Application filed may 10, 1898.)

3 Sheets-Shaet (No Moder.)

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No. 670,838. Patented Mar. 26, IQOI.

D. B. BULLARD.

TURRET LATHE.

(Application filed May 10, 1898.) I (No Model.) 3 Sheets-Shae! 2.

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' Patented Mar 26, I90]. D. B. BULLARD.

TURBET LATHE.

(Application filed May 10, 1898.! (No Model.) 3 Sl|eats-Sheet 3.

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" Nrn STATES FFIcE.

DUDLEY B. BULLARD, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE BULLARD MACHINE TOOL COMPANY, OF SAME PLACE.

TURRET-LATHE.

SPECIFICATION forming part of Letters Patent No. 670,838, dated March 26, 1901.

Application filed May 10, 1898. Serial No. 680,269. (No model.)

To aZZ whom it may concern:

Be it known that I, DUDLEY B. BULLARD, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Turret-Lathes, of which the following is a specification.

This invention relates particularly to the turret and the reciprocating slide upon which said turret is rotatably mounted and to certain mechanical means for unlocking, revolving, and relocking said turret and for regulating the length of successive backward strokes of the turret-slide.

The objects of my invention are, first, to provide means whereby the several back ward strokes of the turret-slide and the points of revolution of the turret into new operative positions may be predetermined; second, to furnish, in connection with the variablestroke feature, automatic means for unlocking, revolving, and relocking the turret at the end of each backward stroke of the slide, so that new tools may be brought successively into working position and there retained during the forward stroke of the turret-slide, and, third, to provide suitable means for rendering the unlocking and revolving mechanism inoperative, and thereby permitting the same cutting-tool to be used continuously. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a plan view of a portion of a turret-lathe bed supporting a base and a turret-slide. Fig. 2 is a vertical section of the same parts as viewed from in front of the line 2* 2*, Fig. 1, with a hexagonal turret shown mounted upon the slide. Fig. 3 is a transverse section of the bed, base, and slide as viewed from the right of the line 3*, Fig. 1. Fig. 4 is a vertical section as viewed from the left of the line 4* 4*, Fig. 3. Fig. 5 is a plan view of the same parts, showing the relation of the turret-slide'to the slide-block when the slide is at the end of its backward stroke. Fig. 6 is a vertical section as seen from in front of the line 6* 6*, Fig. 5. Fig. 7 is another sectional view on the same line 6* 6*, Fig. 5, showing the turret-slide moved forward a short distance relative to the slideblock.

Similar reference-numbers designate like parts in all the figures of the drawings.

4. is the bed of a machine, which supports upon its left-hand end (not shown) a suitable head-stock and chuck and such other parts as are essential to a complete turret-lathe. Upon the right-hand end of the bed is a base 3,

which has a longitudinal series of holes 9 drilled through its front side for the insertion of a stop-pin 8 and which may be clamped to the bed by straps or other suitable means. Supported on the base and adapted to move lengthwise thereon is a turret-slide l, with a stud 25 securely fastened in its forward end, upon which revolves a turret 23, with toolholding apertures 24. Said turret is retained in position on the stud by acap 22 and nut 21 and may be securely clamped to the slide duringa cutting operation by pressure exerted on the bell-dome 20 by means of a long-handled binding-nut 19. Projecting from the bottom of the turret into an annular recess 11 of the turret-slide is a circular series of steel pins 10, corresponding in number to the tool-holding apertures. The bottom of the tu rret is also provided with a corresponding number of taper recesses 26, into one of which projects a taper pin 15, inserted perpendicularly in the turret-slide and constantly forced upward by a coiled spring 29. Mounted in the forward end of the slide and free to move alimited distance lengthwise therein is a slide-block 13, which supports a finger 17 and a latch 37.

Said latch, swiveled upon a pin 34, hasanod set 30, designed to rest against a lug of the slideblock and prevent the latch from falling below the horizontal position. A'hook 33 is adapted to lock the slide-block to the base by engagement with an adjustable stop-pin 8 of the base, and an olfset 31, which projects into the path of travel of a knock-off pin 12, fastened in the turret-slide, and, on impact from said pin, revolves the latch and releases the hook from the adjustable pin. The bottom of the slide-block contains a recess 39, into which projects a steel roll 35, fastened to one arm 36 of a short rocker-shaft 14, journaled in the turret-slide, the other arm of which projects into a perpendicular slot 40 in the taper lock-pin. By revolving the roller-arm to the left the lock-pin is withand glide over it, after which the finger will drawn from the turret and depressed beneath the face of the turret-slide. The finger 17 is bedded in the slide-block and projects upward into a longitudinal slot 18, cut in the turret-slide, and is adapted on the backward movement of the turret-slide relative to the slide-block to oppose the passage of the pin of the turret lying in front of it and to thereby cause the turret to revolve on its axis. The back of the finger is so beveled that a pin 10 of the turret striking it on the forward travel of the turret-slide will depress be forced upward to its original position by against further backward travel.

the spring 28. ward and backward by means of a pilotwheel 6, keyed to a shaft 7,'which operates a pinion 5, meshing with a rack '2, secured to the under side of the turret-slide.

The operation of the unlocking and revolving mechanism is as follows: When a turrettool has finished its out, the turret-slide and slide-block are in the relative position shown ed in the turret-slide, travels backward with the turret-slide until the lower beveled edge of the latch 37 strikes the stop-pin 8, which the operator has previously inserted into that one of thelongitudinal series of holes in the base which will allow the cutting-tool and the tool following it to clear the workwhen revolving. The beveled edge forced beneath the pin 8 throws the latch into a horizontal position, which securely locks the slide-block As the turret-slide continues its backward travel the roll 35 on the front arm of the rocker-shaft, which projects into the recess 39 on the bottom of the slide-'block,-stri-kes the slide-block and is forced to the left sufficiently far to depress the spring lock-pin 15 below the surface of the turret-slide, thereby unlocking the turret and leaving it free to revolve, as is fully shown in Fig. 4. By the time the lock-pin is withdrawn the right-hand pin 10 of the two pins which project into the slot of the slide impinges upon the finger 17. The turret thereupon begins to revolve upon its. axis and continues its revolution until-the l0, which has revolved-into position behind The turret-slide is moved for-' the finger, strikes the bevelededge of the finger and depresses and glides over it. After its passage the finger is thrown up into its normal position by the force of the coiled spring 28. The slide-block remains locked to the base until the knock-off pin 12 strikes the offset of the latch and releases the hook from-the stop-pin 8, when the turret-slide and slide-block assume the relative position shown in Fig. 2 and travel forward together. When the new tool has completed its out, the foregoing operation is repeated, the point of unlocking and revolving being predetermined by inserting the stop-pin 8 in one of the series of 'holesin the base. If the operator desires to use the same tool repeatedly, he can render the unlocking and revolving mechanism inoperative by withdrawing the lock-pin sufficiently far to prevent its inner end from projecting into the path of travel of the latch of the slide-block.

Having thus described my invention, I claim- 1. The combination with the base of a turret-slide having ways out therein, a detached slide-block supported by and free to move forward and backward upon said Ways, and means for locking the slide-blocks at optional points to the base against further backward travel during the continued backward stroke of the turret-slide, and of unlocking it from the base during the forward stroke of said slide.

2. The combination with a base having an adjustable stop 8 of a turret-slide having a knock-off pin 12, a slide-block mounted in said turret-slide having a latch 37 adapted on the backward stroke of the turret-slideto engage the adjustable stop and lock the said slideblock against further backward travel, and on impingement of the knock-off pin on the forward stroke of the slideto release its engagementwith the-adjustable-stop andpermit said slide-block to travel forward with the turret slide.

3. The combination with a base of a turretslide havinga turret rotatably mounted thereon and a slide-block adapted to slide lengthwise therein, means for locking the slideblock to the base at optional points on the backward stroke of the turret-slide, and connecting means between the turret and slideblock adapted to revolve the turret on the continued backward stroke of the turret-slide.

4. The combination with a base having an adjustable stop 8, of a turret-slide having a turret revolub'ly mounted thereon and a knock-off pin 12 inserted thereinyaslide-block within said'slide carrying-a latch adapted on the backward stroke of the slide to engage said adjustable stop-and lock the slide-block to the base, and connecting means between the turret and slide-block for revolving the turret'on the continued backward stroke of the slide.

5. The combination with a base having an adjustable stop, of a turret-slide having an annular groove 11 and a longitudinal slot 18, a turret revolubly mounted thereon having a circular series of pins 10 projecting into said groove, a slide-block recessed in the turretslide carrying a latch 37 adapted to engage the adjustable stop of the base and also a finger 17 projecting into the longitudinal slot adapted to engage the pins of the turret and revolve the same on the continued backward stroke of the turret-slide.

6. The combination with a base of a turretslide, a turret mounted rotatably thereon, a lock-pin inserted. in the turret-slide and adapted to engage and lock said turret against rotation, a slide-block carried within said turret-slide, means for locking said slide-block to, and of unlocking it from the base at variable points in the stroke of the slide, and connecting means between the slide-block and lock-pins adapted on the continued backward stroke of the turret-slide to withdraw said lock-pin from the turret.

7. The combination with a base having an adjustable stop, of a turret-slide having a turret revolubly mounted thereon, and a lockpin inserted therein adapted to engage and lock said turret non-revolubly, a slide-block adapted to slide lengthwise within said turret-slide, means for locking and unlocking said slide-block to and from the base substantially as shown and described, and a twoarmed rocker-shaft 14: journaled in the turret-slide, having one arm operatively connected to the lock-pin and the other arm in the line of travel of the slide-block, adapted on the continued backward stroke of the turret-slide to be revolved, thereby depressing said lock-pin and unlocking the turret.

8. The combination of a base, a turret-slide with a turret revolubly mounted thereon and a slide-block carried therein, a turret lockpin inserted in said slide, means for locking said slide-block to the base at optional points on the backward stroke of the turret-slide,and connecting means between the slide-block and lock-pin and the slide-block and turret, whereby the lock-pin is depressed and the turret revolved on the continued backward stroke of the turret-slide.

9. The combination of a base having an adjustable stop, a turret-slide having an intersecting circular groove 11 and longitudinal slot 18, a turret having a series of pins 10 projecting downward into said groove rotatably mounted on the turret-slide, a slideblock supported in said turret-slide having a latch 37 adapted to engage the adjustable stop 8 and a finger projecting upward into the slot of the turret-slide adapted to engage the pins 10 of the turret, a turret lock-pin, a two-armed rocker-shaft with one arm in engagement with the lock-pin and the other arm in the line of travel of the slide-block, adapted on the continued backward stroke of the turret-slide to unlock the turret, and revolve it upon its axis.

DUDLEY B. BULLARD.

Witnesses:

G. N. MoREHoUsE, I. D. MCLEOD. 

